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Re: VirtualBox USB grey

Ok, but restart as normal user and make sure the guest works well, before trying to get usb working. If you haven't read the FAQ and familiarized yourself with the excellent user manual available from the virtualbox site, I recommend you do that now.

I don't know which guest OS you have, but did you see the usb device mounted in the guest? What type of usb device is it? What guest OS?